Electro-Mechanical Brake Clearance Control for Faster Brake Blending
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Solution Overview
Problem
Existing electro-mechanical braking systems fail to quickly respond to the transition from light to emergency braking, resulting in delayed friction braking engagement and reduced safety and comfort during braking.
Innovation Solution
The electro-mechanical braking system controls the brake clearance between the brake pad and disc to a preset value smaller than the initial value when regenerative braking is detected, allowing for rapid engagement of friction braking by moving the brake pad to a position of slight contact with the disc, thereby shortening response time and improving braking smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake clearance is maintained at the initial value to ensure stability during normal operation, then the system stability is improved, but the response time of the friction braking system increases when emergency braking is required
Solution Approach 1:
The brake clearance is dynamically adjusted based on driving conditions: maintained at initial value during normal operation for stability, and reduced to preset value when regenerative braking is detected to prepare for rapid friction braking engagement. This dynamic adjustment resolves the contradiction between stability and response time.
Solution Approach 2:
The system performs preliminary action by reducing the brake clearance to a preset value in advance when regenerative braking is detected, before emergency braking is actually required. This preparation ensures that when friction braking is needed, the brake pad is already positioned for rapid engagement, reducing response time without compromising normal operation stability.
2Loss of time
If the brake clearance is reduced to a preset value to shorten response time, then the response time is improved, but the brake smoothness deteriorates due to sudden engagement
Solution Approach 1:
The brake clearance is dynamically adjusted based on driving conditions: maintained at initial value during normal operation for stability, and reduced to preset value when regenerative braking is detected to prepare for rapid friction braking engagement. This dynamic adjustment resolves the contradiction between stability and response time.
Solution Approach 2:
The system performs preliminary action by reducing the brake clearance to a preset value in advance when regenerative braking is detected, before emergency braking is actually required. This preparation ensures that when friction braking is needed, the brake pad is already positioned for rapid engagement, reducing response time without compromising normal operation stability.
3Device complexity
If the clearance reduction is only performed when actual regenerative braking force is close to maximum, then the system complexity is reduced, but the response time is insufficient when brake pedal is lightly pressed followed by emergency heavy press
Solution Approach 1:
The system performs preliminary action by reducing the brake clearance to a preset value in advance when regenerative braking is detected, before emergency braking is actually required. This preparation ensures that when friction braking is needed, the brake pad is already positioned for rapid engagement, reducing response time without compromising normal operation stability.
Solution Approach 2:
The system uses feedback from the regenerative braking system to trigger clearance reduction. When regenerative braking is detected, the EMB system receives this feedback and automatically adjusts the brake clearance, creating a closed-loop control that improves response time without significantly increasing system complexity.
Data Source
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Figure 3A~3B
AI summary
The present application relates to a braking method and a braking system. The braking method of the present application may be performed by an electro-mechanical braking system including at least one axle control unit and a plurality of electro-mechanical braking devices provided at ends of wheels and driven by motors to apply friction braking forces to the wheels. The electro-mechanical braking devices are controlled by at least one axle control unit to switch between a state in which no friction braking is applied and a state in which friction braking is applied in response to a braking requirement. The braking method includes: setting a brake clearance between a brake pad and a brake disc to an initial value; determining whether there is a braking requirement; determining wherther regenerative braking is performed; and in response to the performing of regenerative braking, setting the brake clearance to a preset value, wherein the preset value is smaller than the initial value. The brake clearance is reduced before friction braking is required, the respond time to the friction braking requirement is shortened, so that the switch between friction braking and regenerative braking is smoother, thereby the pause and transition during the switch between brakings is effectively reduced.